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30.
Counters • Store counters per Domain and per URL ‣ Leverage HBase increment (atomic read-modify- write) feature • Each row is one speciﬁc Domain or URL • The columns are the counters for speciﬁc metrics • Column families are used to group counters by time range ‣ Set time-to-live on CF level to auto-expire counters by age to save space, e.g., 2 weeks on “Daily Counters” familyMonday, July 25, 11